[fpc-devel] ALGLIB project: 2 months with FreePascal
shadeofgray at yandex.ru
Wed Mar 10 17:19:48 CET 2010
ALGLIB project supports FreePascal since January, 2010. I think that
it is time to share some interesting results.
Currently ALGLIB includes both Delphi and FreePascal versions of
library which allows us to compare popularity of two programming
environments. FreePascal version is written in a plain FreePascal
The only two syntactic tweaks used are RESULT variables and GOTO's,
which were turned on by the unit-level compiler directives. So ALGLIB
for FreePascal can be compiled without passing additional command line
parameters to FPC.
Compiler quality. I should say that 32-bit FPC 2.4.0 works like an
atomic clock. I am routinely testing ALGLIB with many different
combinations of optimization/debugging options and it passes all
tests, except for the tests which discover ALGLIB bugs :) Situation
with 64-bit 2.4.0 is a bit worse - sometimes (1% of cases) FPC crashes
during compilation without any visible reason. However, there exists a
possibility that this bug is not present in 2.5.* branch, so I think
that I should test ALGLIB with newer versions of FPC.
Popularity: Delphi vs. FreePascal. Number of Delphi version downloads
is about 2.5 times larger than hits count for FreePascal version of
ALGLIB. But I think that DOESN'T mean that FreePascal is 2.5 times
less popular in scientific community. In my opinion, downloads of
Delphi version are mostly downloads by students from developing
countries. Delphi is very popular in developing countries because it
is (surprise!) cheap - 5$ on a black market. Compare it with about
2000$ at CodeGear's website. However, there is a steady fraction of
users who prefer to work with FPC - which makes me happy.
Now about the future. As I told, I think that I should use FPC 2.5.*
for unit-testing because one important floating point bug was fixed
only in 2.5.1 However, 2.5.* is in development and I'm not sure what
version it is better to use - last daily snapshot or something else.
Can anyone from FPC team point tell me which 2.5.* release is the most
With best regards,,
Sergey mailto:shadeofgray at yandex.ru
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